Boring-machine.



No. 788,766. PATENTED MAY 2, 1905.

F. W.FRENGH.

BORING MACHINE APPLICATION FILED JULY 5 1904.

fredgrwefivk Inventor Witnesses NlTE STATES Patented May 2, 1905.

PATEr rrrcE.

FREDERICK l/V. FRENCH, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE-HALF TO W. H. BUSCH, JR, OF SAN FRANCISCO, CALIFORNIA.

BORING-MACHINE SPECIFICATION forming part of Letters Patent No. 788,766, dated May 2, 1905. Application filed July 5, 1904. Serial No. 215,366.

To (LZZ 1071/0777, it 'may concern:

Be itknown that I, FREDERICK W. FRENCH, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Boring-Machine, of which the following is a specification.

This invention relates to drilling and boring machines, and has for its object to provide an improved machine of this character which is particularly adapted for drilling or boring openings in overhead beams, girders, floor-joists, and the like for the reception of electrical conductors. It is furthermore desired to secure a continuous rotation of the drill or boring-tool through a reciprocatory movement of the operating means, thereby to facilitate the operation of the machine.

Another object is to materially reduce the length of the machine from, front to rear in order that it may be conveniently introduced between beams, joists, and the like, particu larly when they are closely arranged.

With these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter .more fully described, shown in the accompanying drawings, and particularly pointed out in the appended claim, it being understood that changes in the form, proportion, size, and minor details may be made within the scope of the claim without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a front elevation of the preferred embodiment of my invention. Fig. 2 is a longitudinal sectional View thereof. Fig. 3 is a detail sectional view on the line 3 3 of Fig. 2.

Like characters of reference designate corresponding parts in each and every figure of the drawings.

The present machine includes a handle and an upright frame 31, preferably formed of a metal strap, which is bent to form a substantially rectangular frame, with the ends of the strap embracing the upper end of the handle and secured thereto by means of suitable fastenings 32.

Near the upper end of the frame the front and rear sides thereof are provided with alined openings 33 and 34, in. which are fitted brass bushings 35 and 36, with clamping-nuts 37 and 38 fitted to the outer projected ends of the bushings to retain the same rigidly in the frame. liotatably mounted in the bush ings is a tubular open-ended shaft orspindle 39 for the reception of the shank of a bit 40, the latter having an opening to register with openings in the shaft 39 for the reception of a suitable pin 41 to connect the bit and shaft for simultaneous rotation. By having the shaft open at its opposite ends the shank of the bit may be fitted into either end of the shaft. A gear 42 is fixed upon the shaft within the frame and adjacent the front side thereof, and a sprocket-wheel 43 is likewise fixed upon the shaft adjacent the rear side of the frame, so that motion imparted to either of the gears will be transmitted to the shaft and in turn imparted to the bit.

For imparting motion to the rotatable bitsocket or shaft 39 there is a driving-sprocket 44, which has its hub 45 projected at opposite sides of the gear and mounted to rotate upon a fixed shaft or spindle 46, located below the bit-socket and connected to the frame by means of fastenings 47, which pierce the frame and the respective ends of the spindle. This drive-sprocket is located substantially midway between the sides of the frame, and upon. the front portion of its hub a gear 48 is loosely rotatable and in mesh with the gear 42, while a sprocket-wheel 49 is loosely rotatable upon the rear portion of the hub. Front and rear plates 50 and 51 are detachably connected to the ends of the hub by means of suitable fastenings 52 with the outer portions of the plates or rings overlapping the outer faces of the gears 48 and 49 to retain the same upon the hub of the gear 44. A suitable endless sprocket-chain 53 connects the sprocket-wheels 43 and 49.

The gears 48 and 49 each have a ratchet engagement with the hub of the drive-gear 44, the ratchet mechanism of one of the gears being disposed reversely with respect to that of the other; but otherwise the construction and arrangement of the ratchet mechanism is precisely the same and will be understood by reference to Fig. 8 of the drawings in connection with Fig. 7 thereof. Each hub portion of the drive-gear 44 is provided with a peripheral seat or socket 54, the outer open side of which is closed by one or the other of the gears 48 and 49, and in this seat or recess is a dog or pawl 55, which is termi nally pivoted, as at 56, with a spring 57 interposed between the back of the seat or socket and the free end of the pawl to yieldably maintain said free end at its outer limit, so as to cooperate with the ratchet-notches 58, formed within the hub-opening of the adjacent gear 48 or 49, whereby when the gear 44 rotates in one direction one of the gears 48 or 49 will be interlocked therewith for simultaneous rotation with the drivegear, while the other driven gear will remain stationary with the hub of the gear 44 rotating therein.

The means for controlling the operation of the drivinggear 44 consists of a reciprocatory sprocket-chain 59, which embraces the said gear, with its opposite portions extending downwardly at opposite sides of the handle 30 with hand-grips 60 adjustable longitudinally upon wire cables 61, secured to the respective ends of the operating-chain. In the operation of this embodiment of my invention the drive-chain 59 is reciprocated by manipulation of the hand-grips 60, thereby imparting an oscillating movement to the drive-gear 44, and through the medium of the meshed gears 48 and 42 and the sprocketwheels 43 and 49, connected by the endless sprocket-chain 53, a rotatable movement in a continuous direction will be imparted to the bit-socket 39 and the bit.

It will here be noted, particularly by refer ence to Fig. 1, that the rotatable bit-socket 39 is in vertical alinement with the supportingspindle of the driving-gear, wherefore pressure upon the handle will be applied at the longitudinal axis of the bit without anyside ressure to cause tilting of the latter, where y a straight hole may be conveniently drilled.

Among the advantages possessed by the present machine it will be noted that the length of the machine from front to rear is materially reduced by locating the driving elements side by side rather than one in front of the other, whereby the machine may be readily placed and operated in relatively small spaces as, for instance, where floor beams, joists, and the like are arranged comparatively close together. Furthermore, the reciprocating movement of the actuating chain is conveniently imparted thereto, as it is not necessary to release the hand-grasps and obtain new grasps upon the chain. It is preferred to employ a sprocketchain rather than a cable, for the reason that friction is materially reduced and the opera tion of the machine thereby facilitated, and the life of a sprocket-chain is considerably longer than that of a cable.

Having thus described the invention,what is claimed is A boring-machine for overhead work comprising a portable standard, an open sub stantially rectangular frame rising from the top of the standard, a'rotary shaft mounted transversely across the upper portion of the frame with one end provided with a toolseat, a gear and a sprocket fixed upon the shaft, a fixed shaft carried by the frame below and parallel with the upper shaft, a drive-sprocket loosely rotatable upon the fixed shaft substantially midway of its ends and provided with hub portions projected at opposite sides of the sprocket, a gear rotatable upon one of the hub portions in mesh with the gear of the rotary shaft and having a ratchet connection with the sprocket, a supplemental sprocket rotatably mounted upon the other hub of the drive-sprocket and having a ratchet connection therewith reverse to that of the gear, a sprocket-chain engaging the supplemental sprocket and the sprocket upon the upper rotary shaft, and a sprocket-chain embracing the drive-sprocket and hanging down at opposite sides of the standard with its opposite end portions provided with hand-grasps in reach from the support upon which the standard rests.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

FREDERICK W. FRENCH.

Witnesses:

W. H. BUsoH, Jr., MARTIN ARoNsoHN. 

